Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 2<sup>63</sup> - 1 render rooms unusable, related to federation/federation_base.py
and handlers/message.py
, as exploited in the wild in April 2018.
{ "nvd_published_at": "2018-05-02T16:29:00Z", "cwe_ids": [ "CWE-20" ], "severity": "HIGH", "github_reviewed": true, "github_reviewed_at": "2023-07-25T19:54:26Z" }